The London Mayor admits he enjoys Korean pop singer Psy's cult hit dance track
as he reels off a list of outlandish London exports at the Conservative
Party Conference.

In a speech studded with jokes, Mr Johnson called for the "can do" attitude of the Olympics to be applied to the economy, with British firms becoming "gold medal winners".

On several occasions, Mr Johnson had delegates in gales of laughter with his exuberant delivery.

As he ticked off the various products which London exports to the world - from cakes for the Champs Elysees to bicycles for Holland, mosquito repellent for Brazil and aerials for Korean TVs - he dreamt up the surreal image of himself and Mr Cameron dancing to South Korean pop hit Gangnam Style.

"Gangnam Style is very good," he said. "The Prime Minister and I danced Gangnam Style the other day, you will be shocked to discover."